The cocoa grinding process is the stage where prepared cocoa nibs are transformed into cocoa liquor, also known as cocoa mass. For industrial cocoa processors, this is more than simply reducing particle size. Grinding conditions affect the fineness, flow behavior, and suitability of the cocoa liquor for subsequent processing.
The typical production route is:
Cocoa Beans → Roasting → Cooling → Cracking & Winnowing → Cocoa Nibs → Grinding → Cocoa Liquor
Depending on the required final fineness and downstream process, cocoa nibs may be processed through a colloid mill alone or through a combination of a colloid mill and a ball mill. Understanding the role of each stage helps processors select a suitable grinding configuration rather than simply choosing equipment based on machine size or power.
What Happens Before Cocoa Grinding?
Before grinding begins, cocoa beans need to be prepared through several upstream processing stages.
The beans are first roasted to develop the desired processing characteristics. After roasting and cooling, they enter the cracking and winnowing stage, where the shells are separated from the usable cocoa material.
The resulting cocoa nibs are the primary feed material for industrial cocoa grinding.
Using properly prepared nibs is important because the grinding system is designed to process the cocoa material after shell removal. From this point, the objective is to reduce particle size and convert the nibs into a smooth, flowable cocoa liquor.
This makes the grinding stage an important connection between cocoa bean preparation and downstream processes such as cocoa butter pressing or further cocoa product processing.
How Do Cocoa Nibs Become Cocoa Liquor?
The basic cocoa nibs grinding process can begin with a colloid mill.
The process is:
Cocoa Nibs → Colloid Mill → Cocoa Liquor
As the nibs pass through the grinding equipment, their particle size is progressively reduced. At the same time, the natural cocoa butter contained in the nibs contributes to the formation of a flowable cocoa liquor.
In the described production process, a colloid mill can typically produce cocoa material in the range of approximately 60–80 mesh, depending on the raw material and process configuration.
For some industrial applications, this level of grinding may be sufficient. In these cases, the cocoa liquor can move directly to the next stage of the production line.
However, when a higher fineness is required, an additional grinding stage can be added:
Cocoa Nibs → Colloid Mill → Ball Mill → Cocoa Liquor
The ball mill provides further grinding after the initial colloid milling stage. This configuration gives processors additional control over the final fineness of the cocoa liquor.
Sesuai mesin pengisar biji koko should therefore be selected according to the required processing result and the downstream equipment, rather than assuming that one grinding configuration is suitable for every cocoa product.
How Is Cocoa Liquor Fineness Controlled?
One important principle in industrial cocoa grinding is that higher fineness is not always better.
The final particle size should match the requirements of the next processing stage. In the described production process, excessively fine cocoa liquor can create difficulties during automatic hydraulic cocoa butter pressing. For this reason, operators may need to adjust the grinding conditions according to the actual behavior of the cocoa liquor and the requirements of the pressing process.
Several operating factors can be adjusted during fine grinding.
The speed of the pump before the ball mill can be changed to influence the residence time of cocoa liquor inside the mill. Reducing the residence time can limit the amount of further grinding. The ball mill speed can also be adjusted according to the required fineness.
A scraper fineness gauge can be used to check the grinding result during production.
For production control, a practical target used in this process is keeping the cocoa liquor fineness strictly below 200 mesh. It is crucial to avoid an excessively high mesh size, as overly fine particles will make the cocoa liquor impossible to press. This should be treated as a production control target based on the specific pressing process, rather than a universal industry standard.
The key point is to control grinding according to the complete process rather than simply targeting the finest possible cocoa
liquor.
Why Does Temperature Matter During Cocoa Grinding?
Temperature is another operating factor that needs to be considered during the cocoa grinding process, particularly when a ball mill is used.
The described ball milling system includes both heating and cooling functions. In this production process, the operating temperature is controlled at approximately 75–80°C.
Temperature conditions need to remain compatible with the grinding operation and the handling of cocoa liquor. Since grinding, circulation, and subsequent processing are connected, temperature should be considered together with residence time, grinding intensity, and downstream requirements.
The 75–80°C range described here represents a practical operating condition for this particular production process. It should not be treated as a universal temperature requirement for all cocoa liquor production systems.
For industrial processors, the more useful approach is to determine a suitable operating range based on the selected equipment, cocoa material, target fineness, and the next stage of production.
How Should You Choose a Cocoa Grinding Configuration?
The selection of should begin with the complete processing requirement.
First, confirm the feed material. For this application, the primary material is cocoa nibs obtained after cracking and winnowing.
Second, determine the required processing capacity. The grinding equipment should match both the upstream nib preparation capacity and the downstream equipment capacity.
The LGJMS series provides the following capacity ranges:
| Model | Fineness | Kapasiti | kuasa | Dimensi | Berat badan |
|---|---|---|---|---|---|
| LGJMS-80 | 80–100 mesh | 70–100 kg/h | 4 kW | 680×380×930 mm | 210 kg |
| LGJMS-110 | 80–100 mesh | 100–200 kg/h | 7.5 kW | 750×450×1000 mm | 280 kg |
| LGJMS-130 | 80–100 mesh | 400–600 kg/h | 11–15 kW | 990×450×1100 mm | 400 kg |
| LGJMS-180 | 80–100 mesh | 800–1000 kg/h | 18.5–22 kW | 1000×480×1150 mm | 450 kg |
| LGJMS-240 | 80–100 mesh | 1500–2000 kg/h | 37–45 kW | 1330×650×1300 mm | 1000 kg |
| LGJMS-300 | 80–100 mesh | 3000–4000 kg/h | 75–90 kW | 1450×630×1420 mm | 1600 kg |
The next consideration is fineness. If the required result can be achieved with the initial grinding stage, a colloid mill configuration may be sufficient. If additional fine grinding is required, a ball mill can be added after the initial grinding stage.
Finally, consider the entire production line. The selected grinding configuration should work with upstream roasting and nib preparation as well as downstream cocoa butter pressing or other processing equipment. A properly matched peralatan pemprosesan koko configuration is generally more important than selecting a grinder based on nominal capacity alone.
The cocoa grinding process is therefore best understood as a controlled transition from prepared cocoa nibs to a cocoa liquor suitable for the next production stage. Capacity, fineness, residence time, temperature, and downstream requirements all influence the final equipment configuration.
For processors comparing an initial grinding system with a combined fine-grinding configuration, the starting point should be clear: define the feed material, required hourly capacity, target fineness, and downstream process before selecting the equipment.
Proses kisaran koko menukar nib koko yang telah disediakan kepada cecair koko atau jisim koko. Bergantung pada kehalusan yang diperlukan, proses tersebut boleh menggunakan kilang koloid sahaja atau kilang koloid diikuti dengan kilang bebola.
Biji koko dikisar secara mekanikal sehingga saiz zarahnya dikurangkan dan mentega koko semula jadi menyumbangkan kepada pembentukan cecair koko yang boleh mengalir. Pengisaran selanjutnya boleh dijalankan dengan kilang bebola apabila kehalusan yang lebih tinggi diperlukan.
Kethalusan cecair koko harus sepadan dengan proses hiliran. Pemercikan yang berlebihan tidak semestinya bermanfaat, terutamanya apabila cecair koko akan memasuki proses pengepresan berikutnya. Kethalusan yang sesuai bergantung pada konfigurasi pengeluaran dan keperluan pemprosesan.
Tidak selalu. Kilang koloid mungkin sudah mencukupi apabila kehalusan yang diperlukan dapat dicapai pada peringkat pengisaran awal. Kilang bebola boleh ditambah apabila pengisaran halus tambahan dan kawalan yang lebih baik terhadap kehalusan likur koko akhir diperlukan.